I saw the video and read the story and some of your comments. I saw also professor Stephen H. but this idea can't be done in reality simply because of 2 reasons:
1- The stronger the laser beam which is concentrated and Powerful magnified will surly demolish any heading object because of the high frequency. It will be more powerful than the laser beam is used in surgery operations which is easy to cut the skin without blood (Burning it actually). Also there is more stronger than that which is cutting steel!
2- Any travelling object in the space is moving in curved directions and has to use surrounding gravities for the nearby objects like the moon or mars or Saturn or any big planet to force it away in space. If we use stronger laser beam (Peaceful one) then the object will not go that high speed without interrupted by other huge celestial objects around the journey, I don't know why professor Stephan could not calculated those 2 matters unless they have created new powerful laser without any damaging on objects plus maybe they have created new celestial mechanics which we don't know!!!
Finally, I think the laser can send massages to space (Like what NASA has experimented years ago) but not sending or pushing objects at all. Please change the subject without writing the word "US"
Thank you
Astronomer since 1992